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. 1997 Jul 15;25(14):2792–2799. doi: 10.1093/nar/25.14.2792

Hybridisation based DNA screening on peptide nucleic acid (PNA) oligomer arrays.

J Weiler 1, H Gausepohl 1, N Hauser 1, O N Jensen 1, J D Hoheisel 1
PMCID: PMC146815  PMID: 9207026

Abstract

Arrays of up to some 1000 PNA oligomers of individual sequence were synthesised on polymer membranes using a robotic device originally designed for peptide synthesis. At approximately 96%, the stepwise synthesis efficiency was comparable to standard PNA synthesis procedures. Optionally, the individual, fully deprotected PNA oligomers could be removed from the support for further use, because an enzymatically cleavable but otherwise stable linker was used. Since PNA arrays could form powerful tools for hybridisation based DNA screening assays due to some favourable features of the PNA molecules, the hybridisation behaviour of DNA probes to PNA arrays was investigated for a precise understanding of PNA-DNA interactions on solid support. Hybridisation followed the Watson-Crick base pairing rules with higher duplex stabilities than on corresponding DNA oligonucleotide sensors. Both the affinity and specificity of DNA hybridisation to the PNA oligomers depended on the hybridisation conditions more than expected. Successful discrimination between hybridisation to full complementary PNA sequences and truncated or mismatched versions was possible at salt concentrations down to 10 mM Na+and below, although an increasing tendency to unspecific DNA binding and few strong mismatch hybridisation events were observed.

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